Stenberg Patricia L, Bowerman William J
Sunriver Nature Center & Observatory, Box 3533, Sunriver, Oregon 97707, USA.
J Wildl Dis. 2008 Apr;44(2):464-8. doi: 10.7589/0090-3558-44.2.464.
Between 2001 and 2003, we screened blood smears of 156 Oregon spotted frogs (Rana pretiosa) from three populations in central Oregon for blood parasites. A Lankesterella sp. and a Trypanosoma sp. were detected in 31% and 35% of the frogs, respectively. Parasite loads were generally light, with Lankesterella sporozoites in 1-2% of erythrocytes, and extracellular trypanosomes were seen at rates of about one parasite per 200 fields of view at 1,000x. Little work has been published on hemoparasites of ranids in the western USA in the past 30 yr. Because of the recent taxonomic division of the Rana pretiosa complex, this may be the first published report of blood parasites for R. pretiosa sensu stricto. Both parasites reported here differed in morphologic features and morphometric comparisons from previous descriptions of anuran hemoparasites. Much work remains to sort out the taxonomy of hemoparasites among western USA ranids and to determine the ecological significance of these parasites; both tasks are important steps in understanding and managing these, and related, sensitive and threatened species.
2001年至2003年间，我们对来自俄勒冈州中部三个种群的156只俄勒冈斑点蛙（Rana pretiosa）的血涂片进行了血液寄生虫筛查。分别在31%和35%的青蛙中检测到一种兰克斯特氏虫属（Lankesterella sp.）和一种锥虫属（Trypanosoma sp.）寄生虫。寄生虫负荷通常较轻，红细胞中兰克斯特氏虫属子孢子的比例为1%至2%，在1000倍放大倍数下，每200个视野中可见细胞外锥虫的比例约为一个寄生虫。在过去30年里，关于美国西部蛙科动物血液寄生虫的研究报道很少。由于最近对Rana pretiosa复合体进行了分类划分，这可能是首次发表的关于狭义R. pretiosa血液寄生虫的报告。这里报道的两种寄生虫在形态特征和形态测量比较上与先前对无尾目血液寄生虫的描述有所不同。要理清美国西部蛙科动物血液寄生虫的分类，并确定这些寄生虫的生态意义，仍有许多工作要做；这两项任务都是了解和管理这些以及相关的敏感和濒危物种的重要步骤。
